CN201311129Y - Heat pump air-conditioning system - Google Patents

Abstract

The utility model discloses a heat pump air-conditioning system, which comprises a compressor, an evaporation system, a condenser, a four-way reversing valve, and a gas-liquid separator. The condenser and the evaporation system are connected through refrigeration and heat exchange pipelines. The evaporation system includes a high-temperature evaporator and a low-temperature evaporator connected in series. The inlet of the high-temperature evaporator is connected with refrigeration and heat exchange pipelines. A cooling throttle valve 2 is arranged between the separator 1 and the low-temperature evaporator, and a heating check valve is connected in parallel on the refrigerating throttle valve 2. The gas outlet of the gas-liquid separator 1 is connected to an ejector, and the suction port of the ejector It is connected to the refrigeration outlet of the low-temperature evaporator, and the outlet of the ejector communicates with the gas-liquid separator through a four-way reversing valve. The utility model can greatly improve the refrigeration performance of the heat pump, improve the quality of indoor air treatment, save energy, and be more economical and environmentally friendly.

Description

A heat pump air conditioning system

technical field

The utility model relates to the field of heating, ventilation and air conditioning, in particular to a heat pump air conditioning system.

Background technique

In air conditioning engineering, indoor temperature and humidity are two important parameters that affect thermal comfort and need to be controlled. In the current air-conditioning project, the method of cooling is mainly used to reduce the temperature and dehumidify. The independent fresh air system is a new HVAC technology that has developed rapidly in recent years. In comfort air conditioning, sensible heat usually accounts for the main part of the load, while latent heat (humidity load) accounts for a minority. By treating the heat and humidity loads separately, the evaporation temperature of the refrigerator can be increased during operation, thereby improving the efficiency, while the humidity load can be borne by the fresh air that has been treated to a low humidity content, eliminating indoor residual humidity and ensuring the ventilation of the house Ventilation improves indoor air quality.

A heat pump is a heat engine that works in a reverse cycle. It can absorb heat from a low-temperature environment with less high-grade energy input and release heat several times the input energy to a high-temperature environment. The low temperature environment can be air, soil, water, etc. Heat pumps can be used as cooling or heating equipment, such as house heating, air conditioning, and drying, heating or cooling of materials. In recent years, with the rapid development of my country's economy and society, the living standards of residents have been continuously improved, and the requirements for the comfort of the living environment have also been continuously improved. Therefore, heat pumps with functions such as air conditioning and heating, especially air source heat pumps, are cheap The convenient feature has been widely used, and it is expected that its production and application will continue to expand with the development of the economy and society. However, the principle of thermodynamics determines that the performance of the heat pump is affected by the temperature of the cold and heat source when it is working. The air source heat pump uses the external ambient air as its cold and heat source, and its performance is not only affected by the external ambient temperature, but also by the cold and heat source output to the indoor end. It is related to the temperature level, and the impact of ambient temperature is opposite to the trend of heating and air conditioning load changes: in winter, the temperature drops and the heating load of the house increases, but the heating capacity of the heat pump decreases with the temperature drop, the performance deteriorates, and the temperature drops to To a certain extent, conventional air source heat pumps cannot even work normally; in summer, as the temperature rises, the air conditioning load increases, but the cooling capacity of the heat pump decreases as the temperature rises, and the performance also deteriorates.

In addition, the current heat pump technology mainly adopts the convective heat exchange method on the indoor use side. In summer, when the air conditioner is cooling, in order to maintain and control the indoor temperature and humidity, the cooling method is used to cool down and dehumidify the room so that it is in the thermal comfort zone of the human body. It is necessary to reduce the evaporation temperature of the heat pump, thereby affecting the performance of the heat pump, and the condensed water produced by cooling and dehumidification will also bring about indoor air quality problems and affect people's health; when heating in winter, the supply air temperature that meets the thermal comfort requirements of the human body should not be too low. This requires the heat pump to maintain a high condensing temperature and pressure, which also reduces its heating performance. To further improve and enhance the performance of heat pumps, it is necessary to find new technical directions in addition to continuing to carry out the aforementioned research in depth.

Utility model content

The technical problem to be solved by the utility model is to provide a heat pump air-conditioning system, which can greatly improve the cooling and heating performance of the heat pump, improve the quality of indoor air treatment, save energy, and be more economical and environmentally friendly.

In order to solve the above technical problems, the utility model adopts the following technical solutions: a heat pump air-conditioning system, including a compressor, an evaporation system, a condenser, and a four-way reversing valve. There is a gas-liquid separator, and the condenser and the evaporating system are respectively communicated with the air outlet of the compressor through a four-way reversing valve, and the condenser and the evaporating system are communicated through refrigeration and heat exchange pipelines, which are characterized in that: The evaporation system includes a high-temperature evaporator and a low-temperature evaporator connected in series. The inlet of the high-temperature evaporator is connected with refrigeration and heat exchange pipelines. There is a refrigeration throttle valve 2 between the separator 1 and the low-temperature evaporator, and a heating check valve is connected in parallel with the refrigeration throttle valve 2. The gas-liquid separator 1 outlet is connected to an ejector, and the suction port of the ejector It is connected to the refrigeration outlet of the low-temperature evaporator, and the outlet of the ejector communicates with the gas-liquid separator through a four-way reversing valve.

Preferably, the refrigeration and heat exchange pipelines include bridging refrigeration branch one and heating branch one, as well as liquid receivers and dry filters connected to the refrigeration and heat exchange pipelines, and the refrigeration branch one It includes a cooling one-way valve and a cooling throttling valve connected in series, and the heating branch one includes a heating one-way valve and a heating throttling valve connected in series.

Preferably, the evaporation systems are several groups arranged in parallel.

As an improvement, each group of evaporating systems is provided with an independent cooling throttle valve 1, and a heating check valve is connected in parallel to the cooling throttle valve 1, which is better than the independent control of each group of evaporating systems.

The utility model adopts the above-mentioned technical scheme, sets the evaporation system as a high-temperature evaporator and a low-temperature evaporator, and connects an injector in parallel at both ends of the low-temperature evaporator, and uses a part of the refrigerant vapor generated by the high-temperature evaporator as working gas to inject, add The refrigerant vapor generated by the low-pressure low-temperature evaporator is deeply throttled, so that the high-temperature evaporator can provide a high-temperature cold source to handle the sensible heat load of the air conditioner, that is, cooling, and the low-temperature evaporator handles the latent heat load, that is, dehumidification, so that the larger Improve the cooling performance of the heat pump, improve the quality of indoor air treatment, save energy, and be more economical and environmentally friendly.

Description of drawings

Below in conjunction with accompanying drawing, the utility model is further described:

Fig. 1 is a structural schematic diagram of Embodiment 1 of the heat pump air-conditioning system of the present invention;

Fig. 2 is a schematic structural diagram of Embodiment 2 of the heat pump air-conditioning system of the present invention;

Fig. 3 is a schematic structural diagram of Embodiment 3 of the heat pump air-conditioning system of the present invention.

Detailed ways

As shown in Figure 1, it is a heat pump air-conditioning system embodiment 1 of the present invention, including a compressor 1, an evaporation system, a condenser 4, a four-way reversing valve 2, the air return port of the compressor 1 and the four-way reversing valve 2 There is a gas-liquid separator 3 between them, and the condenser and the evaporation system are respectively communicated with the air outlet of the compressor through a four-way reversing valve, and the condenser and the evaporation system are communicated through the refrigeration and heat exchange pipeline 01. The evaporation system includes a high-temperature evaporator 91 and a low-temperature evaporator 92 connected in series, the inlet of the high-temperature evaporator is connected to refrigeration and heat exchange pipelines, and a gas-liquid separator-10 is arranged between the high-temperature evaporator and the low-temperature evaporator. , between the gas-liquid separator 1 and the low-temperature evaporator, there is a refrigeration throttle valve 2 63, and a heating check valve 52 opposite to the flow direction is connected in parallel with the refrigeration throttle valve 2 63, and the gas-liquid separator 1 10 The air port is connected with an ejector 11 , the suction port of the ejector 11 is connected with the cooling outlet of the low-temperature evaporator 92 , and the outlet of the ejector 11 communicates with the gas-liquid separator 3 through the four-way reversing valve 2 . The refrigeration and heat exchange pipeline 01 includes a bridging refrigeration branch one and a heating branch one, and a liquid receiver 7 and a dry filter 8 connected to the refrigeration and heat exchange pipelines. The heating branch one is arranged in the opposite direction, the cooling branch one includes a cooling one-way valve 51 and the cooling throttle valve one 61 connected in series, and the heating branch one includes a heating one-way valve 52 and a cooling valve connected in series. Thermal throttle valve 62 .

As shown in Figure 2, it is a structural schematic diagram of Embodiment 2 of the heat pump air-conditioning system of the present invention. On the basis of Embodiment 1, the evaporation system is set as two groups arranged in parallel, and an independent cooling system is installed on each group of evaporation systems. Throttle valve one 61, the heating one-way valve 52 opposite to its flow direction is connected in parallel on the refrigeration throttle valve one 61, which is better than the independent control of each group of evaporation systems.

As shown in Figure 3, it is a structural schematic diagram of Embodiment 3 of the heat pump air-conditioning system of the present invention. On the basis of Embodiment 1, the evaporation systems are set as three groups arranged in parallel, and independent refrigeration throttling is set on each group of evaporation systems. The valve one 61, the refrigeration throttle valve one 61 is connected in parallel with the heating one-way valve 52 opposite to its flow direction.

As shown in Figure 2, under refrigeration conditions, after the refrigerant is discharged from the compressor 1, it enters the condenser 4 through the four-way reversing valve 2 to condense into a liquid, and then enters the liquid receiver 7 and the dry filter through the refrigeration check valve 51 8. Refrigeration check valve 51, after throttling by refrigeration throttling valve-61, enters high-temperature evaporator 91 to absorb heat and refrigerate, and then enters vapor-liquid mixture into vapor-liquid separator-10, where the vapor-liquid mixture is separated into two phases, the gas enters as the working steam of the ejector 11 and enters the ejector, injecting the refrigerant from the low-temperature evaporator 92; The device 92 absorbs heat and evaporates, and after becoming a gaseous state, it is ejected into the ejector by the ejector 11, mixed with the working steam, boosted, and then enters the vapor-liquid separator 3 through the four-way reversing valve 2, and then enters the compressor 1 to complete a refrigeration cycle. During the heating operation of the heat pump, after the refrigerant is discharged from the compressor 1, it enters the ejector 11 through the four-way reversing valve 2, and then enters the low-temperature evaporator 92. The separator one 10 enters the high-temperature evaporator 91. After the refrigerant is condensed into a liquid in the high-temperature evaporator, it enters the liquid receiver 7, the drying filter 8, the heating check valve 52 through the heating check valve 52, and then passes through the heating check valve 52 to After being throttled by the heat throttle valve 62, it enters the condenser to absorb heat and evaporate. After becoming a gas, it enters the vapor-liquid separator 3 through the four-way reversing valve 2 and then enters the compressor 1 to complete the heating cycle, as shown by the arrow in the figure. To indicate the direction of flow.

The above-mentioned high-temperature evaporator and low-temperature evaporator can be various types of heat exchangers, which are used for heating or cooling water, air and other secondary refrigerants.

Claims (5)

1. A heat pump air-conditioning system, comprising a compressor, an evaporation system, a condenser, and a four-way reversing valve, a gas-liquid separator is arranged between the air return port of the compressor and the four-way reversing valve, the condenser and the evaporator The system is respectively communicated with the air outlet of the compressor through the four-way reversing valve, and the condenser and the evaporation system are communicated through refrigeration and heat exchange pipelines. It is characterized in that: the evaporation system includes high-temperature evaporators and low-temperature Evaporator, the inlet end of the high-temperature evaporator is connected with refrigeration and heat exchange pipelines, a gas-liquid separator 1 is provided between the high-temperature evaporator and the low-temperature evaporator, and a refrigeration unit is provided between the gas-liquid separator 1 and the low-temperature evaporator Throttle valve two, refrigeration throttle valve two is connected in parallel with a heating one-way valve, the first outlet of the gas-liquid separator is connected to an ejector, the suction port of the ejector is connected to the cooling outlet end of the low-temperature evaporator, and the outlet of the ejector The outlet communicates with the gas-liquid separator through a four-way reversing valve. 2. The heat pump air-conditioning system according to claim 1, characterized in that: the refrigeration and heat exchange pipelines include a bridging refrigeration branch one and a heating branch one, and the refrigeration branch one includes a series connection The cooling one-way valve and the cooling throttle valve one, the heating branch one includes the heating one-way valve and the heating throttle valve connected in series. 3. The heat pump air-conditioning system according to claim 2, characterized in that: a liquid reservoir and a dry filter are arranged on the refrigeration and heat exchange pipelines. 4. The heat pump air-conditioning system according to claim 1, 2 or 3, characterized in that: the evaporation systems are several groups arranged in parallel. 5. The heat pump air-conditioning system according to claim 4, wherein each group of evaporating systems is provided with an independent cooling throttle valve 1, and a heating check valve is connected in parallel with the cooling throttle valve 1.

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